(On many of the retro calculators pictured above, you can click to see more photos and information)

RetroCalculators.com is most interested in smaller mechanical calculators and mechanical adders (not electric or solid-state), as well as unusually shaped slide rules. If you have something that you think might be of interest, send a note from here.

Other Sites of Interest for RetroCalculators:

Below is a video of a clever adder made of wood and marbles (by Matthiaswandel):

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Disclaimer and Thanks

This site is not for profit and is dedicated to celebrating the ingenuity of mechanical calculating devices of all varieties. Many of the photos appearing here were taken by me, but others came from ebay auctions or other varied sources. If some photo or other intellectual property of yours appears on this website without proper credit or permission, please know that I beg your pardon and am dedicated to correcting such errors and omissions as quickly as possible. I would be honored to give proper credit, or if necessary, honor-bound to remove any material that should not appear, per your instructions.

To all the owners of photos or mechanical calculating devices that appear on this site and elsewhere, my thanks for sharing these marvelously clever items with the web community.